Your import(您的进口)
import {BrowserRouter as Router, Route} from "react-router";
should be(应该)
import {BrowserRouter as Router, Route} from "react-router-dom";
A note from the react-router npm package page:(来自react-router npm软件包页面的注释：)
Note: This package provides the core routing functionality for React Router, but you might not want to install it directly.(注意：这个包提供了React Router的核心路由功能，但是您可能不想直接安装它。) If you are writing an application that will run in the browser, you should instead install react-router-dom .(如果要编写将在浏览器中运行的应用程序，则应安装react-router-dom 。) Similarly, if you are writing a React Native application, you should instead install react-router-native .(同样，如果您正在编写React Native应用程序，则应该安装react-router-native 。) Both of those will install react-router as a dependency.(这两个都将安装react-router作为依赖项。)
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